I have ordered Velvet's through an LFS before. It was strictly a pick up upon delivery type of thing. They have no place to keep them and no way to feed them if they did. In addition, the supply of these guys is pretty tough at best. I was on a waiting list for months and never did get any. The same sort of thing applies to Berghia. I know Instar was on a waiting list for his first breeding pair for months. Berghia can be bred in captivity. To the best of my knowledge, Velvet's can not. In addition, Velvet's have a very short life span (~ 6 months). Just my luck, I would get some 5 month old Velvet's. I had some reasonable success with the Velvet's, but I think you would have to order a lot of them to have success in a large tank in controlling flatworms. I certainly wasn't able to wipe them out with velvets although I know that Fin Addict had good success.

I have had a lot better success with flatworm control with spot tail wrasses. I have tried just about every supposed flatworm eating fish ever mentioned and these guys did the trick. I have one in both of my tanks. One of them came from another MAASTARD after he had cleaned up his tank.

I got fltaworms several years ago from LS I bought from an LFS. Ever since then I have tried everything to get rid of them, including several heavy doses of Flatworm Exit. While I am not totally flatworm free, I am well on the way to it and am longer experiencing flatworm blooms.

I have tried Berghia as well and I just don't think I had enough aiptasia to provide enough food to establish a breeding colony. The aiptasia returned after the berghia apparently died off. I think that berghia are probably the way to go in heavily infested tanks, but I have had much better success with butterflies in tanks with just a few aiptasia.